The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 31, 1978
Filed:
Mar. 18, 1976
Applicant:
Inventor:
Lawrence James Moriarty, Galion, OH (US);
Assignee:
North Electric Company, Galion, OH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
137199 ; 55524 ; 179179 ; 174 / ;
Abstract
A water-proof air-pressure equalizing valve for an enclosure capable of being pressurized to match a wide range of ambient air pressures including that corresponding to the pressure of several feet of water when totally submerged, such as the instrument housing of a military-type field telephone set, comprises a sandwich structure having a thin air-permeable hydrophobic membrane clamped between two rigid perforated sheets providing mechanical support against deformation due to water or air pressure.